The Office of the National Security Adviser (ONSA) has denied allegations that it procured thallium sulphate, a highly toxic substance. The claim was earlier raised by former Kaduna State Governor, Nasir Ahmad El-Rufai, who requested clarification over reports that the chemical had allegedly been sourced from Poland. In an official response dated February 13, 2026, and signed on behalf of National Security Adviser Nuhu Ribadu, ONSA stated clearly that it neither purchased nor initiated any process to acquire the substance.

Following the denial, the matter has been referred to the Department of State Services (DSS) for investigation. ONSA indicated that El-Rufai and any other individuals with relevant information would be invited to provide evidence. With this move, what started as a request for clarification has now shifted into a formal security review, placing the focus on proof rather than speculation.

El-Rufai had earlier asked for details regarding the alleged procurement, including intended use, supplier information, storage plans, and regulatory oversight. Thallium sulphate is widely known as a dangerous chemical capable of causing severe harm even in small quantities, making the allegation sensitive. The swift denial by ONSA suggests concern about public anxiety and the reputational implications for national security institutions.

The development comes amid heightened political tension between the two figures, adding a broader dimension to the controversy. Analysts note that the outcome of the DSS investigation will determine whether the issue remains a political dispute or raises deeper institutional concerns. For now, the central issue remains clear: evidence will decide the direction of the case.